Electrical storage system

An electrical storage system comprising:

• an electrical storage device in which a plurality of electrical storage blocks are connected in series with each other, each of the plurality of electrical storage blocks including at least one electrical storage element which is charged or discharged;
• a relay configured to switch between an on state where the electrical storage device is connected to a load and an off state where connection of the electrical storage device with the load is interrupted;
• a controller configured to control an on-off state of the relay;
• and
• a current interruption circuit configured to interrupt energization of the electrical storage device by causing the relay to switch from the on state to the off state,
• the current interruption circuit including:
• an alarm circuit configured to output an alarm signal indicating that any one of the electrical storage blocks is in an overcharged state or an overdischarged state by comparing an input voltage value of each electrical storage block with a threshold;
• a latch circuit configured to retain the alarm signal;
• and
• a transistor configured to cause the relay to switch from the on state to the off state upon reception of an output signal of the latch circuit, and
• wherein the controller is further configured to execute control for causing the relay to switch into the on state and determine an energization state of the electrical storage device while control for causing the alarm circuit to output the alarm signal is being executed by changing one of the voltage value and the threshold, input to the alarm circuit.